package com.aaa.ssm.util;

import com.aaa.ssm.entity.SysUser;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @ fileName:LoginInterceptor
 * @ description:
 * @ author:张圣福
 * @ createTime:2023/10/26 19:16
 * @ version:1.0.0
 */

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler)
            throws Exception {
        // 获取请求的URL
        String url = request.getRequestURI();
        // URL:除了登录请求外，其他的URL都进行拦截控制
        if (url.indexOf("/loginServlet") >= 0) {
            return true;
        }
        // 获取Session
        HttpSession session = request.getSession();
        SysUser user = (SysUser) session.getAttribute("USER_SESSION");
        // 判断Session中是否有用户数据，如果有，则返回true,继续向下执行
        if (user != null) {
            return true;
        }
        // 不符合条件的给出提示信息，并转发到登录页面
        request.setAttribute("message", "您还没有登录，请先登录！");
        request.getRequestDispatcher("/html/login.html")
                .forward(request, response);
        return false;
    }
    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
    }
    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
    }
}
